Here is the full list of all 55 Yakuza Kiwami achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Obtain all other achievements.
Completed the game in Legend Mode.
Completed all of the Climax Battles.
Completed all substories.
Defeated Amon.
Completed 100% of the Completion List.
Obtained EX Rank on Haruka's Requests.
Upgraded all Majima Everywhere abilities.
Completed all training for Komaki Style.
Won all tournaments in the underground coliseum.
Played all minigames.
Slugger Majima forced his way into a fight.
Assaulted by Majima from a manhole.
Completed "Wife of a Yakuza."
Assaulted by Majima from above.
Thug Majima forced his way into a fight.
Met the mysterious lady, Goromi.
Breaker Majima forced his way into a fight.
The Mad Dog of Shimano forced his way into a fight.
Reached Rank B in Majima Everywhere.
Obtained all Soul, Technique, and Body abilities.
Met Zombie Majima.
Won against all rivals in MesuKing.
Completed "The Fake Mizuki's Truth."
Spent a steamy moment with Rina.
Won all Pocket Circuit races.
Spent a steamy moment with Yui.
Enjoyed mahjong with a hostess.
Successfully asked a hostess out on a date.
Walked 1km during Premium Adventure while holding Haruka's hand.
Completed 50% of the Completion List.
Completed the final chapter.
Completed "Man On a Ledge."
Completed chapter 12.
Completed chapter 11.
Completed chapter 10.
Completed chapter 9.
Completed chapter 8.
Completed chapter 7.
Completed "Bet On A Champ."
Completed "A Doctor's Duty."
Completed chapter 6.
Completed "My Baby's a Showgirl."
Completed 30 substories.
Completed "The Price of an F-Cup."
Completed 10 substories.
Completed chapter 5.
Obtained at least 10 Soul, Technique, and Body abilities.
Met Officer Majima.
Completed chapter 4.
Got chased by Majima.
Completed chapter 3.
Completed chapter 2.
Completed chapter 1.
Collected the money owed.